MyItemReader.java

/*
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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package org.javaee7.batch.sample.chunk.mapper;

import java.io.Serializable;
import java.util.StringTokenizer;
import javax.batch.api.BatchProperty;
import javax.batch.api.chunk.AbstractItemReader;
import javax.batch.runtime.context.JobContext;
import javax.inject.Inject;
import javax.inject.Named;

/**
 * @author Arun Gupta
 */
@Named
public class MyItemReader extends AbstractItemReader {
    public static int totalReaders = 0;
    private int readerId;
    
    private StringTokenizer tokens;
    
    @Inject
    @BatchProperty(name = "start")
    private String startProp;
    
    @Inject
    @BatchProperty(name = "end")
    private String endProp;
    
    @Inject
    private JobContext context;
    
    @Override
    public void open(Serializable e) {
//        Properties jobParams = BatchRuntime.getJobOperator().getParameters(context.getExecutionId());
//        int start = (Integer)jobParams.get("start");
//        int end = (Integer)jobParams.get("end");
        int start = new Integer(startProp);
        int end = new Integer(endProp);
        StringBuilder builder = new StringBuilder();
        for (int i=start; i<=end; i++) {
            builder.append(i);
            if (i < end)
                builder.append(",");
        }

        readerId = ++totalReaders;
        tokens = new StringTokenizer(builder.toString(), ",");
    }
    
    @Override
    public MyInputRecord readItem() {
        if (tokens.hasMoreTokens()) {
            int token = Integer.valueOf(tokens.nextToken());
            System.out.format("readItem (%d): %d\n", readerId, token);
            return new MyInputRecord(token);
        }
        return null;
    }
}